Rounding Mismatch Between Spatial-Domain and Transform-Domain Video Codecs

The mismatch between a spatial-domain encoder and a transform-domain decoder due to rounding can cause serious video quality degradation after a series of inter-coded frames. The mismatch is rooted on the fact that rounding is a nonlinear operation, and hence its equivalent in the transform domain does not exist. We analyze the mathematical property of the rounding operation and propose a practical solution that provides an optimal approximation of the rounding operation in the transform-domain. The proposed solution is able to reduce the mismatch and preserve image quality. Experimental results are shown to demonstrate the effectiveness of the solution

[1]  Mohammed Ghanbari,et al.  Post-processing of MPEG2 coded video for transmission at lower bit rates , 1996, 1996 IEEE International Conference on Acoustics, Speech, and Signal Processing Conference Proceedings.

[2]  Hyun Wook Park,et al.  Analysis of IDCT and motion-compensation mismatches between spatial-domain and transform-domain motion-compensated coders , 2005, IEEE Transactions on Circuits and Systems for Video Technology.

[3]  Mohammed Ghanbari,et al.  Hybrid DCT/pixel domain architecture for heterogeneous video transcoding , 2003, Signal Process. Image Commun..

[4]  Information technology — Coding of audio-visual objects — Part 3 : Audio Technologies de l ' information — Codage des objets audiovisuels — Partie , 1999 .

[5]  Thomas Wiegand,et al.  Draft ITU-T recommendation and final draft international standard of joint video specification , 2003 .

[6]  Ming-Ting Sun,et al.  Video transcoder architectures for bit rate scaling of H.263 bit streams , 1999, MULTIMEDIA '99.

[7]  Shih-Fu Chang,et al.  Manipulation and Compositing of MC-DCT Compressed Video , 1995, IEEE J. Sel. Areas Commun..

[8]  Mohammed Ghanbari,et al.  A frequency-domain video transcoder for dynamic bit-rate reduction of MPEG-2 bit streams , 1998, IEEE Trans. Circuits Syst. Video Technol..

[9]  Chen Chen,et al.  A practical solution to transform-domain rounding , 2005, 2005 13th European Signal Processing Conference.

[10]  Ming-Ting Sun,et al.  Digital Video Transcoding , 2005, Proceedings of the IEEE.

[11]  陳宸.  轉換域運算於MPEG-2 to H.264 Transcoding上之應用 , 2005 .

[12]  J. G. P. Groenveld,et al.  The performance of a hybrid videoconferencing coder using displacement estimation in the transform domain , 1986, ICASSP '86. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[13]  K. Rijkse,et al.  H.263: video coding for low-bit-rate communication , 1996, IEEE Commun. Mag..

[14]  Boon-Lock Yeo,et al.  A fast algorithm for DCT-domain inverse motion compensation based on shared information in a macroblock , 2000, IEEE Trans. Circuits Syst. Video Technol..

[15]  K. J. Ray Liu,et al.  Motion Compensation on DCT Domain , 2001, EURASIP J. Adv. Signal Process..

[16]  Neri Merhav,et al.  Fast algorithms for DCT-domain image downsampling and for inverse motion compensation , 1997, IEEE Trans. Circuits Syst. Video Technol..

[17]  Itu-T.  Video coding for low bitrate communication , 1996 .

[18]  J. Biemond,et al.  A new motion-compensated transform coding scheme , 1985, ICASSP '85. IEEE International Conference on Acoustics, Speech, and Signal Processing.

[19]  Gertjan Keesman,et al.  Transcoding of MPEG bitstreams , 1996, Signal Process. Image Commun..